Process of preparing phthaloyl-2.3-thionaphthenes



thene and its substitution products can Patented May 21 1929.

UNITED STATES PATE NT OFFICE;

FRITZ MAYER, OF FRANKFORT-nN-T HE-MAlNp GERMANY, -.ASSIGNOR TO GRASSELLI DYESTUFF CORPORATION, OF N EW YORK N'. Y., A CORPORATION OF DELAWARE.

PROCESS OF PREPARING IHTHALOYL-2.l3-THION.APHTHENES.

No Drawing. Application filed January 25 1927, Serial No. 163,568, and in Germany January 29, 1926.

a I have found that phthaloyl-2.3-thionaphbe obtained by causing phthalic anhydride or a substitution product thereof to act upon i a G9 CQ EIQE O 8 OHv The compounds obtainable by the process of my present invention can be used as dyestuffs or as intermediate products for the preparation of thesame. p 1

The following example serves to illustrate my invention, but it is not intended to limit it thereto, all parts being by weight:

2 iparts of thionaphthene are stirred in the cold for about 24- hours with 33' parts of phthalic anhydride and 25 parts of aluminium chloride in a carbon disulfide solution, and the mixture thus obtained is heated on the water-bath until the reaction is complete. The reactionproduct is then decomoil-the water-bath for several hours.

posed with ice and hydrochloric acid,. the carbon disulfide is blown off and the residual thionaphthenoylbenzoi'c acid is purified by re-precliipitating it from sodium carbonate solutio I v j parts of the acid thus obtained are poured over in the cold with a quantity-of thionyl chloride suflicient as dissolve it, and the-mass is then gently heated in order to complete the reactioni The thionyl chloride is then distilled ofl' in a vacuum, the residue is dissolved in carbon disulfied, mixed with parts of aluminium chloride, and the whole is heated The reaction mixture is then decomposed by means of ice and hydrochloric acid and the carbon disulfide-is blown off' The residual substance is found to be phiihaloyl-fzfi-thid,

naphthene which, after {re er stallization, has a correct melting point 0' 212214' G. The phthaloyl-Q.8-thionaphthene compounds tarelyellow to brown powders which are insoluble in water, alkalies and acids and yield with alkaline hydrosulfite'feebly colored vats dyeing woolj yellow; to orange tints. TheseQ-compiounds are described but not .claimedin my copending application Serial late thionaphthene or a derivative thereof, and condensing the thionaphthenoyl benzoic acids thus obtained. The reaction takes place according to the following formula dride compound are intended to include'the derivatives and substitution products of the saidcompounds.

I claim:

1'. The process of preparing a phthaloyl- 2.3-thionaphthene compound which comprises causing a phthalic anhydride compound to act upon a thionaphthene compound in the presence of aluminium chloride and.

then further subjecting to a nuclear condensation the thionaphthenoyl benzoic acid compound thus obtained. 7

2. The process of preparing a phthaloyl 2.3-thionaphthene compound which comprises causing a phthalic anhydride coinpound to act upon a thionaphthene compound in thepresence of aluminium chloride and then further successively treating with thionyl chloride and aluminiumchloride the thionaphthenoyl benzoic acid compound thus obtained. a

3.. The process of preparing phthaloyl- 2.3-thionaphthene of the following formula:

chloride the thionaphthenoyl benzoic acid thus obtained and further treating with aluminium chloridein the presence of boiling carbon disulfide the reaction product after its separation from the excess 'of 'tliionyl chloride.

' 5 naphthene compounds of the following general formula:

x o x k l V wherein X stands for hydrogen or a substituent.

6. As a new product, phthaloyl-2.3-fhi0 being a yellow powder which .is insoluble in naphthene, corresponding most probably to the formula:

water, alkalies and acids and yields with alkaline hydrosulfite a feebly colored vat which dyes Wool ellow tints.

In testimony whereof, I affix my signature.

PROFESSbR DR. FRITZ MAYER. 

